Add UMA metrics to track the source of homescreen icons on launch.

chrome/browser/android/banners/app_banner_infobar_delegate_android.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/android/banners/app_banner_infobar_delegate_android.h"
 
 #include "base/android/jni_android.h"
 #include "base/android/jni_string.h"
 #include "base/location.h"
 #include "base/strings/string16.h"
@@ skipping 197 matching lines @@
     }
     SendBannerAccepted(web_contents, "play");
     return was_opened;
   } else if (!web_app_data_.IsEmpty()) {
     AppBannerSettingsHelper::RecordBannerInstallEvent(
         web_contents, web_app_data_.start_url.spec(),
         AppBannerSettingsHelper::WEB);
 
     ShortcutInfo info;
     info.UpdateFromManifest(web_app_data_);
+    info.UpdateSource(ShortcutInfo::SOURCE_APP_BANNER);
     content::BrowserThread::PostTask(
         content::BrowserThread::IO,
         FROM_HERE,
         base::Bind(&ShortcutHelper::AddShortcutInBackgroundWithSkBitmap,
                    info,
                    *app_icon_.get()));
 
     SendBannerAccepted(web_contents, "web");
     return true;
   }
@@ skipping 25 matching lines @@
 
   TrackDismissEvent(DISMISS_EVENT_BANNER_CLICK);
   return true;
 }
 
 bool RegisterAppBannerInfoBarDelegateAndroid(JNIEnv* env) {
  return RegisterNativesImpl(env);
 }
 
 }  // namespace banners